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PAL has its own supply and it is not a factor of steem supply, so the inflation is not additive.

If you hold both, your inflation devaluation would be a weighted average, depending on the amount you hold of each, not a sum.

PAL is paired to STEEM.

It trades against STEEM and requires using steem as gateway, but it is not paired to it.

To say PAL is paired to STEEM is like saying EOS is paired to eth, just because that's where the ico was.